diff --git a/lustre/include/obd.h b/lustre/include/obd.h
index 710ee2e45b28f8a0e9c2a23d19b5c5076088353c..fd2a42b230ab6fc4ad50bb6e78736539821e3847 100644
--- a/lustre/include/obd.h
+++ b/lustre/include/obd.h
@@ -52,7 +52,7 @@ struct loi_oap_pages {
 struct osc_async_rc {
         int     ar_rc;
         int     ar_force_sync;
-        int     ar_min_xid;
+        __u64   ar_min_xid;
 };
 
 struct lov_oinfo {                 /* per-stripe data structure */